Q. 85.0( 2 Votes )
Hydrogen gas is not widely used as a reducing agent because
A. hydrogen decomposes to atomic hydrogen at higher temperature
B. risk of explosion with water
C. hydrogen isomerises to ortho hydrogen at higher temperature.
D. many metals form hydrides at lower temperatures.
Many of the metallic oxides react with the hydrogen to form respective hydrides and hence hydrogen is not widely used as reducing agent in metallurgy.
So the correct answer is d.
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i. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
ii. What type of reaction is this?
iii. Write a balanced chemical equation to represent the above reaction.
A brown substance ‘X’ on heating in air forms a substance ‘Y’. When hydrogen gas is passed over heated ‘Y’, it again changes back into ‘X’.
i. Name the substance ‘X’ and ‘Y’
ii. Name the type of chemical reactions occurring during both the changes.
iii. Write the chemical equations of the reactions.Xam idea - Science